Another idea would be for GCP to handle export to a physical device and that device would be shipped to a known location (to both GCP and the client) and accessible by either but offline and cold stored. And similar to how paper records are stored you could put in a request to access the records and thereby verify their existence (which you can't do with cloud data other than the copy that you are able to access).
Fwiw, Iron Mountain lost about 60 physical records file boxes that we had ..
Another idea would be for GCP to handle export to a physical device and that device would be shipped to a known location (to both GCP and the client) and accessible by either but offline and cold stored. And similar to how paper records are stored you could put in a request to access the records and thereby verify their existence (which you can't do with cloud data other than the copy that you are able to access).
Fwiw, Iron Mountain lost about 60 physical records file boxes that we had ..